Photographic exposing-clock



cfKEssEs.

PHOTOGRAPHIC EXPOSING CLOCK.

APPLICAUON man ocT.21. 1920.

1,384,528. Patented July 12, 1921.

JNVENTR.

UNITED STATES CHARLES KESSES, OF NEW YORK, N. Y.

PHOTOGRAPH'IC EXPOSING-CLOCK.

Specification of Letters Patent.

Patented July 12, 1921.

Application filed October 21, 1920. Serial No. 418,553.

To all whom t may concern.'

Be it known that I, CHARLES Knssns, citizen of the United States, andresident of New York city, in thecounty of New York and State of NewYork, have invented a certain new and useful PhotographicExposing-Clock, of which the following is a specilication.

My invention relates to improvements in an exposing device whichoperates automatically in conjunction with the photographic printingmachine and the objects of my improvements are, first;-

To provide an exposing clock for a printing machine, which makes anynumber of prints from a negative, each one having eX- actly the sametime of exposure, after the device is regulated for the density of thenegative, the strength of the light in the cabinet and the Asensitivityof the paper; second, a noiseless device Iwhich is very convenient inthe dark room; third, a device which `works in conjunction with aprinting machine and operates automatically, which can be regulated fromone to sixty seconds, and opens' the circuit of the current therebystopping the exposure of the print, returns the hand to its fixedposition and closesthe circuit to be ready for the next exposure;fourth, an indicator which counts automatically the number of exposures.

I attain these objects by the mechanism illustrated in the accompanyingdrawing, in which- Figure I is a perspective view of the entire machine;Fig. II, a detailed front view of a regulator carrying insulated wires;Fig. III, a top view of the inside of a printing machine, showing theelectric connection with the exposing device.'

Similar letters refer to similar parts throughout the several views. Y

A dial A is secured to the casing or frame work B. A shaft C is in twoparts, 1

and 2. A clutch D is secured to the shaft C1 and is meshed to a clutchDD which is slidabl arranged on the shaft C2. A rail E secure to saidshaft is fitted in a corresponding opening in the clutch DD to conneetor disconnect both shafts, as shown by the dotted line position of saidclutch.

A lever F is secured to said clutch and is operatively connected to theprinting cabnet, to move the clutches together by closing of the cabinetand disconnect by opening of the same.

A spring issecured to the shaft C and to the frame or casing B to returnthe hand T when the Same is released from the clutch DD' to its fixedposition at a pin H.

A regulator I a separate view of which is shown in Fig. II is movablyarranged on a rim K which surrounds the dial A. Said regulator is in twoparts, part 1 is secured by a set screw L to the rim K, the part 2 is alever arranged to open and close the circuit. Each part kcarriesl anelectric wire M, which is insulated by hard rubber, the ends of saidwires must be iattened to fit together, and a spring N is secured to thetwo parts of the regulator to press said wires together. The second partwill be moved by the hand of the clock toward part l and so break thecircuit. From this regulator both wires running insulated in a bracket Oand are carried to and around a pulley P which is loosely fitted aroundthe shaft C. The regulator, the bracket and pulley are joined togetherto allow combined turning about said shaft.

4.From the pulley both wires are leaded to the printing cabinet, to aposition Q shown in Fig. III which is a top view of the inside of thecabinet. Before connecting the wires, the current to the cabinet must bedisconnected. An opening in the side of the cabinet `must be insertedand the wire must be cut at said position', to be joined and insulated,each part of the cut wire to each part of the wire from the regulator.

The clock work operates the electric device being connected through theshaft` C C. The upper part of said clock is a paddle wheel R, the sizeof the paddles must be in proportion to give the right air-resistant forthe movement of the hand around the dial required, at the lower part ofsaid clock work is a spring or a weight S. A chain of gears and pinwheels connects said paddle wheel with said spring.

An anchor escapement for the clock work i may be substituted for thepaddle wheel, if the noise from the same is not objectionable.`

Now the cooperation of the several parts throughout a complete circle ofmovements involved in the printing is shown. The regulator is moved toindicate the desired time of exposure, and secured in place by the screwL to the rim K, the negative and the paper are placed in position, thecabinet is closed thereby moving the clutches DI) together andconnecting the hand T with the clockwork. The hand moves' to theregulator or lever 2, opens the circuit and stops at part l, therebystopping the exposure of the print.

B the opening of the cabinet the clutch is released, thereby'releasinthe ha nd, which is returned by the spring to its fixed position' at thepin H and the regulator is closed by the spring N to be ready for thenext exposure.

An indicator U` is secured above the dial A and is operatively connectedto the hand T by the lever V said hand will move the indicator each timethe device is actuated and the'hand is hindered in returning by a.curved bracket W which is secured to'the dial.

I am aware, that prior to my invention clocks have been used forcounting the seconds for exposure. I therefore do not claim such acombination but I. claim the combi'- nation, in an exposing device for aphotographic printer, of a clock having a regulator which carries thecurrent, movably attached around the dial and means on said regulatortoY open the circuit by the movement of the hand, all substantially asset forth.

I claim:

l. In combination with a time clock, having a dial with a switchoperating device, a frame having two hinged parts, one part containingthe clock operating mechanism and the other part carrying thel dial thetwo parts so arranged that the switch operating device and clockoperating means are connected by a clutch on the closing of the bringsaid contact plates in close position,

a support for said switch and its wires, a frame having two hingedparts, one part containing the clock operating mechanism and the otherpart carrying a dial and moving arm, the two parts so arranged that thearm and clock operating means are connected by a clutch on the closingof the frame, thereby separating said contact plates after apredetermined period by the moving arm, substantially as set forth. v

3. In a time clock having an electric device, the combination of aswitch and its support, a dial carrying switch, operating means, a framehaving two hinged parts, one part containing clock mechanism and theother part -carrying the dial with its switch operating means the twoparts so arranged that the switch operating means and clock mechanismare connected by a clutch to open the switch through said means,substantially as described.

4. The combination in a time clock having an electric device whichoperates in conjunction With a photo printer, the combination of acircuit connector having the contact plates in a closed position and ismovably attached to a rim which is secured around the dial and means toseparate said contact plates by the movement of the hand;

, al1 substantially as set forth.

'- Si ed at 'New York city, in the county ew York and State of New York,this 7th day of Sept., A. D. 1920.

CHARLES KESSES.

